Trim problems on 2001 20 ft mariah. 5.0 305 mercruiser in/outboard.?

Question

Power trim works fine when lowering unit with down switch and also will go up but only when I hit the trailer switch on then throttle handle. It will not however go up when I hit the up button on the throttle. There is no noise from the pump what so ever. Possible bad switch???? Any help would be greatly appreciated. Thanks in advance

Answer 1

Sounds like the trim limit sender is shot.  You can test this by checking for voltage on the trigger terminal on the up solenoid on the trim pump.  Replacement is not really a backyard project, take it to a tech.